Security Update for Microsoft Office (November 2018) (macOS)

high Nessus Plugin ID 118934
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

An application installed on the remote macOS or Mac OS X host is affected by remote code execution vulnerability.

Description

The Microsoft Office application installed on the remote macOS or Mac OS X host is missing a security update. It is, therefore, affected by the following vulnerability:

- A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Excel.
In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) containing a specially crafted file designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file. The security update addresses the vulnerability by correcting how Microsoft Excel handles objects in memory (CVE-2018-8574, CVE-2018-8577)

Solution

Microsoft has released a set of patches for Microsoft Office for Mac.

See Also

http://www.nessus.org/u?5696476b

http://www.nessus.org/u?6ca7f685

http://www.nessus.org/u?f5e3fcde

Plugin Details

Severity: High

ID: 118934

File Name: macos_ms18_nov_office.nasl

Version: 1.7

Type: local

Agent: macosx

Published: 11/14/2018

Updated: 11/1/2019

Dependencies: macosx_office_installed.nbin

Risk Information

CVSS Score Source: CVE-2018-8574

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 9.3

Temporal Score: 6.9

Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:apple:mac_os_x, cpe:/a:microsoft:office, cpe:/a:microsoft:excel_for_mac, cpe:/a:microsoft:excel, cpe:/a:microsoft:powerpoint, cpe:/a:microsoft:outlook, cpe:/a:microsoft:onenote

Required KB Items: Host/MacOSX/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 11/13/2018

Vulnerability Publication Date: 11/13/2018

Reference Information

CVE: CVE-2018-8574, CVE-2018-8577

BID: 105833, 105834